Hydrogels

Matzelle, Thomas; Reichelt, Rudolf

doi:10.1002/imic.200990057

Cited by 1 publication

(1 citation statement)

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“…The different behaviour at temperatures higher than the PNIPAAm LCST can be attributed to the difference in the nature of crosslinking. Previous compression tests on PNIPAAm gels showed also the dependence of the elastic modulus ( E ) value of PNIPAAm gels in the collapsed state on the technique and on the way the gel is prepared, and also on temperature 32–34. Investigations of the rheological properties of a series of comb‐like copolymers of PNIPAAm and methoxy poly(ethylene glycol) methacrylate (poly(NIPAAm‐ co ‐mPEGMA)) showed the dependence of mechanical properties on both copolymer ratio and concentration immediately upon phase transition.…”

Section: Resultsmentioning

confidence: 99%

Rheological and thermal behaviour of poly(N‐isopropylacrylamide)/alginate smart polymeric networks

Dumitriu¹,

Mitchell

Vasile³

2011

Polymer International

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Interpenetrating polymeric networks based on sodium alginate and poly(N-isopropylacrylamide) (PNIPAAm) covalently crosslinked with N,N -methylenebisacrylamide have been investigated using rheology, thermogravimetry, differential scanning calorimetry, X-ray diffraction measurements and scanning electron microscopy (SEM). An improved elastic response of the samples with a higher PNIPAAm content and increased amount of crosslinking agent was found. The temperature-responsive behaviour of the hydrogel samples was evidenced by viscoelastic measurements performed at various temperatures. It is shown that the properties of these gels can be tuned according to composition, amount of crosslinking agent and temperature changes. X-ray scattering analysis revealed that the hydrophobic groups are locally segregated even in the swollen state whilst cryo-SEM showed the highly heterogeneous nature of the gels.

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Section: Resultsmentioning

confidence: 99%